Hecto-
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Look up hecto- in Wiktionary, the free dictionary.
Hecto (symbol: h) is a decimal unit prefix in the metric system denoting a factor of one hundred. It was adopted as a multiplier in 1795, and comes from the Greek Script error: No such module "Lang". Script error: No such module "Lang"., meaning "hundred". In 19th century English it was sometimes spelled "hecato", in line with a puristic opinion by Thomas Young.[1][2] Its unit symbol as an SI prefix in the International System of Units (SI) is the lower case letter h.
The prefix is rarely used in general, but has certain specific applications:
- hectopascal (hPa), in meteorology, for atmospheric pressure, the modern equivalent of the traditional millibar.
- hectolitre (hl or hL), in agriculture, for liquids (notably milk and alcoholic beverages) and bulk commodities (e.g., grain).
- hectogram (hg), in agronomy, for quantities of animal feed (hectogram/animal) and for measures of agricultural productivity (hectogram/hectare); also used in Italy abbreviated as Script error: No such module "Lang"., and in Canada, New Zealand and Sweden simply as 100 g, for retail sale of cold cuts and meat.
- hectometre (hm), in radio astronomy, occasionally used to indicate a radio band by wavelength
- In surveying, a square hectometre is called a hectare (ha, or 100 ares = 1 hm2 = 10,000 m2).
See also
References
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- ^ Page Module:Citation/CS1/styles.css has no content.Brewster, David (1832). The Edinburgh Encyclopaedia. Vol. 12 (1st American ed.). Joseph and Edward Parker. Retrieved 2015-10-09.
- ^ Page Module:Citation/CS1/styles.css has no content.Dingler, Johann Gottfried (1823). Polytechnisches Journal (in Deutsch). Vol. 11. Stuttgart, Germany: J.W. Gotta'schen Buchhandlung. Retrieved 2015-10-09.
| Prefix | Base 10 | Decimal | Adoption [nb 1] | |
|---|---|---|---|---|
| Name | Symbol | |||
| quetta | Q | 1030 | 1000000000000000000000000000000 | 2022[1] |
| ronna | R | 1027 | 1000000000000000000000000000 | |
| yotta | Y | 1024 | 1000000000000000000000000 | 1991 |
| zetta | Z | 1021 | 1000000000000000000000 | |
| exa | E | 1018 | 1000000000000000000 | 1975[2] |
| peta | P | 1015 | 1000000000000000 | |
| tera | T | 1012 | 1000000000000 | 1960 |
| giga | G | 109 | 1000000000 | |
| mega | M | 106 | 1000000 | 1873 |
| kilo | k | 103 | 1000 | 1795 |
| hecto | h | 102 | 100 | |
| deca | da | 101 | 10 | |
| — | — | 100 | 1 | — |
| deci | d | 10−1 | 0.1 | 1795 |
| centi | c | 10−2 | 0.01 | |
| milli | m | 10−3 | 0.001 | |
| micro | μ | 10−6 | 0.000001 | 1873 |
| nano | n | 10−9 | 0.000000001 | 1960 |
| pico | p | 10−12 | 0.000000000001 | |
| femto | f | 10−15 | 0.000000000000001 | 1964 |
| atto | a | 10−18 | 0.000000000000000001 | |
| zepto | z | 10−21 | 0.000000000000000000001 | 1991 |
| yocto | y | 10−24 | 0.000000000000000000000001 | |
| ronto | r | 10−27 | 0.000000000000000000000000001 | 2022[1] |
| quecto | q | 10−30 | 0.000000000000000000000000000001 | |
| ||||
- ^ a b Page Module:Citation/CS1/styles.css has no content.On the extension of the range of SI prefixes. CGPM. Resolution 3 of the 27th CGPM (2022). BIPM. 18 November 2022. doi:10.59161/cgpm2022res3e. Retrieved 5 February 2023.
- ^ Page Module:Citation/CS1/styles.css has no content."Metric (SI) Prefixes". NIST.
